A surprise singer to the song 'Hijau' when veteran singer Zainal Abidin let Tun Dr Siti Hasmah continue with his evergreen tune, during the Earth Day celebration held at Taman Tugu, Kuala Lumpur on Saturday.

A surprise singer to the song 'Hijau' when veteran singer Zainal Abidin let Tun Dr Siti Hasmah continue with his evergreen tune, during the Earth Day celebration held at Taman Tugu, Kuala Lumpur on Saturday.